Adjustable pressure-pump.



No. 816,964. PATENTED APR. 3, 1906. E. S. CLARK.

ADJUSTABLE PRESSURE PUMP.

APPLIOATION IILBD PEB.3,1906.

r'rnu ornron.

Specification of Letters Patent.

Patented April 3, 1906.

Application filed February 3, 1905. Serial No 248.977-

To aZZ whom, it may concern:

Be it known that I, EDWARD S. CLARK, of the city of Boston, county of Suffolk, and State of Massachusetts, have invented an Improvement in Adjustable Pressure Pumps; and I do hereby declare that the following is a clear, full, and exact description of the same.

This invention relates to pressure-pumps in which it is desired to accumulate a pressure of some predetermined amount and then. automatically prevent a further accumulation of pressure without the necessity of stopping or regulating the operation of the pump by personal attention.

Figure 1 is a vertical section of a pumpcase for the purpose described, the pump plunger, valves, tripping lever, adjustable spring, and pressure-piston being in elevation. Fig. 2 is a sectional elevation of an. alternative method of transmitting the pressure beyond the pressure-valve into motion for lifting the suction-valve and shows a diaphragm used in place of a piston.

1 is the pump-case, provided with a suction-inlet 2 and pressure-outlet 3. The suction-valve 4 and pressure-valve 5 are situated near their respective inlet and outlet. A pump-plunger 6 is operatively entered. into the upper part of the pump case 1, which here forms a barrel with the usual stuflingboX, gland, and means for compressing packing about said plunger. Situated in the suction-chamber of the pump-case is a lever 7, carried on a pivot 10, one end of which bears on the under side of the suction-valve 4:, the opposite end on a spring 8. This spring is capable of adjustment by means of the screw 9. Bearing on the lever 7 at some convenient point between the end which bears on the suction-valve 4 and the pivot 10, so as to obtain any desired leverage, is a piston 11, provided with liquid nching-grooves 12 or other piston-packing. This piston is so situated with relation to all other parts previously mentioned that on being moved by pressure entering the pressure-inlet 13 it lifts the suction-valve 4 from its seat and prevents it from tightly closing and at the same time compresses the spring 8 beyond the pressure originally imparted to it by the screw 9. The outlet 3 is connected by any suitable means to any receptacle in which it is desired to maintain a pressure. This receptacle is also connected. by any suitable means to the pressure-inlet 13. It is obvious that these several parts can be arranged in a number of dif ferent ways to accomplish this same result and that the chambers containing the spring 8 or piston 11 can be made integral with or attached to the case 1 without departing from the spirit of the invention and accomplish the same result, which with the apparatus here designed would be accomplished as follows: Upon reciprocating motion being given to the plunger 6 liquid would be drawn in through the inlet 2 and suction-vlave eland forced out through the pressure-valve 5 and outlet 3 to a suitable receptacle (such as a steam-boiler or a pressure-cylinder on a hydraulic press) and the inlet 13. As the pressure accumulates beyond the valve 5 it will attempt to force the piston 1 1 upward and by causing the lever 7 to rotate about its pivot 10 compress the spring 8, operatively connected to the opposite end of this lever but in order to actually cause movement of the lever 7 the pressure acting on the piston 11 must be in excess of the tension imparted to the spring 8 by the screw 9. hen this actually results, the spring 8 will partly close, allowing the lever 7 to rotate on the pivot 10, lifting the suction-valve 4 from its seat, and thus prevent a further accumulation of pres sure beyond the valve 3 until the pressure is relieved or reduced between the pump-outlet 3 and the pressure-inlet 13, as in a flashboiler by using the steam or in a hydraulic press by voiding some of the water under pressure.

It is obvious that a diaphragm may be used in place of the piston 11 in order to transmit the pressure beyond the pressurevalve 5 into motion for lifting the lever 7 and suction-valve 4. This is shown in Fig. 2, small scale.

Having thus fully described the construction and operation of one method of carrying this invention into effect, what I desire to sesure by Letters Patent is as follows:

1. In a pressure -pump, the combination with an operative plunger, in a pump case provided with an inlet and. outlet valve and a compartment beneath the inlet-valve, of a lever fulcrumed in said compartment adapted to lift the inlet-valve, means for actuating said lever by the accumulation of pressure caused. by said plunger, and means for opposing the action of said accumulated pressure.

2. In a pressure ump, the combination with an operative unger, in a pump-case provided with an inlet and outlet valve and a compartment beneath the inlet-valve, of a le- IIO ver fulcrumed in said compartment adapted to lift the inlet-valve, means such as a piston actuating said lever by the accumulation of pressure caused by said plunger, and means for opposing the action .of said accumulated pressure.

3. In a pressure pump, the combination with an operative plunger, in a pump-case provided with an inlet and outlet valve and a compartment beneath the inlet-valve, of a lever iulcrumed in said compartment adapted to lift the inlet-valve, means for actuating said lever by the accumulation of pressure caused by said plunger, and a spring opposing the action of said accumulated pressure.

4. In a pressure-pump, the combination with an operative plunger, in a pump-case provided with an inlet and outlet valve and a compartment beneath the inlet-valve, of a lever iulcrumed in said compartment adapted to lift the inlet valve, means for actuating said lever by the accumulation of pressure caused by said plunger, and an adjustable spring opposing the action of said accumulated pressure.

5. In a pressure-pump, the combination with an operative plunger, in a pump-case provided with an inlet and outlet valve and a compartment beneath the inlet-valve, of a lever fulcrumed in said compartment adapted to lift the inlet-valve, means such as a piston actuating said lever by the accumulation of pressure caused by said plunger, and an adjustable spring for opposing the action of said accumulated pressure.

6. In a pressure-pump, the combination with an operative plunger, in a pump-case.

provided With an inlet and outlet valve and a compartment beneath the inlet-valve, of a lever fulcrumed in said compartment adapted to lift the inlet valve, means for actuating said lever by the accumulation of pressure caused by said plunger, and means for opposing the action of said accumulated pressure, at a predetermined amount.

In testimony whereof I have hereunto affixed my signature in the presence of two subscribing witnesses.

EDVVARD S. CLARK.

I/Vitnesses'.

EDWIN D. SIBLEY, ISAAC H. DAVIS. 

